Good morning, I'm doing a payment area, where the user can buy a monthly product and a single purchase product, the project owner demands that the payment be the same for both forms, it can be on credit card or Bank slip. But it does not make sense to pay a product that is paid every month in installments with a single purchase. Would anyone have any suggestions?

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  [1]: https://i.sstatic.net/pjqTh.png